Ransom.Win32.TFLOWER.A
Trojan.Win32.DelShad.aex (Kaspersky); Ransom.FileCryptor (Malwarebytes)
Windows
Threat Type: Ransomware
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Downloaded from the Internet
This Ransomware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It encrypts files with specific file extensions. It drops files as ransom note.
TECHNICAL DETAILS
1,102,848 bytes
EXE
Yes
06 Aug 2019
Encrypts files, Connects to URLs/IPs, Displays message/message boxes
Arrival Details
This Ransomware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Installation
This Ransomware adds the following processes:
- bcdedit.exe /set {default} recoveryenabled no
- bcdedit.exe /set {default} bootstatuspolicy ignoreallfailures
- bcdedit.exe /set {current} recoveryenabled no
- bcdedit.exe /set {current} bootstatuspolicy ignoreallfailures
- vssadmin.exe delete shadows /all /quiet -> Deletes Shadow Copy
Autostart Technique
This Ransomware adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{Random Text} = {malware location}\{malware name}.exe
Other Details
This Ransomware does the following:
- It connects to the following URL:
- https://www.{BLOCKED}ofacilesicuro.com/wp-content/plugins/wp-statistics/{BLOCKED}l.php
- It adds encryption marker at the start of the file:
- *tflower
Ransomware Routine
This Ransomware encrypts files with the following extensions:
- 0
- 00
- 000
- 001
- 002
- 003
- 01
- 1
- 3gp
- 7z
- a
- a3m
- a3w
- a4m
- a4p
- a4w
- a5w
- aam
- aas
- abk
- abs
- ace
- ada
- adb
- adf
- adi
- aep
- af2
- af3
- ai
- aif
- aifc
- aiff
- aim
- ais
- akd
- all
- ams
- anc
- apk
- aps
- ari
- arj
- array
- art
- asa
- asc
- asd
- asf
- asm
- asp
- asx
- atw
- au
- avi
- avr
- backup
- bak
- bas
- bat
- bdf
- bgl
- bhd
- bi
- bif
- bik
- bin
- bip
- bk
- bkf
- bks
- bmp
- book
- brdf
- brx
- bsp
- btm
- bud
- bw
- bwv
- c
- cab
- cad
- cal
- cap
- cc
- ccb
- cch
- cco
- cct
- cda
- cdf
- cdi
- cdm
- cdr
- cdt
- cdx
- cer
- cert
- cfg
- cgi
- cgm
- chk
- chm
- ci
- cif
- cil
- class
- cll
- cls
- cmd
- cmf
- cmv
- cmx
- cnf
- cod
- config
- content
- cpp
- cpr
- cpt
- cpx
- crd
- crp
- crt
- cs
- csc
- csp
- cst
- csv
- ctl
- cxx
- dae
- dat
- db
- dbc
- dbf
- dbx
- dcm
- dcs
- dct
- dcu
- dcx
- dds
- dek
- dem
- dep
- der
- dewf
- dex
- dib
- dif
- dig
- dir
- dll
- doc
- docx
- dod
- dor
- dot
- dps
- draw
- drv
- drw
- dsf
- dsg
- dsm
- dsp
- dsq
- dsw
- dtd
- dv
- dxr
- eda
- edb
- emf
- eml
- epr
- eps
- exe
- fax
- fbx
- fcd
- fla
- flc
- flo
- flv
- gdb
- gho
- gif
- gl
- go
- grp
- gz
- h
- hipnc
- hpp
- ht
- htm
- html
- htx
- hwp
- icc
- icm
- ico
- idf
- idx
- incf
- inf
- ini
- inp
- iso
- jar
- java
- jbf
- jf
- jfif
- jif
- jpe
- jpeg
- jpg
- js
- json
- jsp
- jtd
- jtf
- kar
- kbx
- kdb
- kdbx
- key
- lab
- ldf
- lib
- log
- lst
- m1v
- m3u
- mad
- maf
- mam
- map
- maq
- mar
- mat
- max
- mbx
- md5
- mdb
- mdf
- mdbx
- mid
- mkv
- mli
- mod
- mor
- mov
- mp2
- mp3
- mp4
- mpa
- mpe
- mpeg
- mpg
- mpp
- mrimg
- msg
- msi
- mst
- mxf
- ncb
- nds
- obj
- ocx
- ods
- odt
- ogg
- olb
- ole
- olp
- ora
- p12
- pak
- pas
- pbd
- pbl
- pem
- pfx
- php
- php3
- phtml
- pic
- pjt
- pjx
- pkg
- png
- pot
- ppk
- pps
- ppt
- pptx
- prfpset
- propert
- prproj
- psd
- psp
- pub
- py
- pyc
- pyw
- qic
- qif
- ra
- ram
- rar
- rb
- rdf
- rdg
- reg
- res
- rm
- rsrc
- rtf
- s
- sav
- sbl
- scc
- sfx
- sh
- shtml
- shw
- sid
- ska
- so
- spl
- sqc
- sql
- sqlite
- sqr
- swa
- swf
- sys
- tar
- taz
- tga
- tgz
- thn
- tif
- tiff
- tlb
- tlog
- tmp
- tps
- trm
- ttf
- txt
- udk
- ult
- upk
- url
- vbp
- vbs
- vbw
- vbx
- vct
- vdi
- vhd
- vhdx
- vir
- viv
- vob
- vsd
- vss
- vxd
- w3l
- wab
- wad
- war
- wav
- wbem
- wbk
- wcm
- wdb
- wid
- wil
- wiz
- wll
- wmf
- wmv
- wow
- wp
- wpd
- wpf
- wpg
- wps
- wpt
- x
- xar
- xla
- xlb
- xlc
- xld
- xlk
- xll
- xlm
- xlo
- xls
- xlsx
- xlt
- xlv
- xlw
- xml
- xmp
- yaml
- z
- zap
- zip
- ztl
It avoids encrypting files with the following strings in their file path:
- sample music
- windows
- !_Notice_!.txt
- {malware filename}
It drops the following file(s) as ransom note:
- {Infected Directory}\!_Notice_!.txt
SOLUTION
9.850
15.282.08
06 Aug 2019
15.283.00
07 Aug 2019
Step 1
Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.
Step 2
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 3
Restart in Safe Mode
Step 4
Delete this registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- {random text} = {malware location}\{malware name}.exe
- {random text} = {malware location}\{malware name}.exe
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as Ransom.Win32.TFLOWER.A. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.
Step 6
Restore encrypted files from backup.
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